2011
DOI: 10.3139/146.110616
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An investigation into the microstructure and weldability of a tantalum-containing cast cobalt-based superalloy

Abstract: The weld metal microstructures and the weldability of a tantalum-containing cast cobalt-based superalloy were investigated using gas tungsten arc welding. It was found that the tantalum carbides in the base metal have remained stable up to the fusion line. The results showed that the formation of Ta-rich carbides (TaC) is very sensitive to time and temperature; so the as-weld microstructure is unstable from a metallurgical aspect. The formation of fine precipitates due to the high cooling rate of the welding p… Show more

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Cited by 6 publications
(3 citation statements)
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“…These carbides are not stable at high temperature and they tend to partially, and sometimes totally, dissolve at temperatures as high as 1100°C. This phenomenon is also encountered in cobalt-based superalloys in which MC carbides, notably tantalum carbides (TaC) [31][32][33][34], are more stable. Furthermore, these TaC carbides obtained in cobalt-based superalloys present a script-like morphology issued from their eutectic solidification with matrix.…”
Section: Introductionmentioning
confidence: 98%
“…These carbides are not stable at high temperature and they tend to partially, and sometimes totally, dissolve at temperatures as high as 1100°C. This phenomenon is also encountered in cobalt-based superalloys in which MC carbides, notably tantalum carbides (TaC) [31][32][33][34], are more stable. Furthermore, these TaC carbides obtained in cobalt-based superalloys present a script-like morphology issued from their eutectic solidification with matrix.…”
Section: Introductionmentioning
confidence: 98%
“…Often, the resultant microstructures in fusion-based welded joints must be modified in order to improve the part mechanical properties. These microstructural modifications are often performed by post-weld heat treatments, which can induce dissolution or formation of new phases/precipitates or promote stress relieving [78][79][80][81].…”
Section: Cocrfenimn Hea Systemmentioning
confidence: 99%
“…They lead to {matrix & carbides} eutectics which are 40°C more refractory [14,15]. They are also more stable at high temperature [16,17], even if long stay at elevated temperature may induce TaC degradation [16,18] with possible deleterious consequences on high temperature properties [19,20]. Beside new metallurgical ways for cobalt-based superalloys such as single-crystal solidification [21], γ/γ' Co-based alloys [22] or Co-based superalloys strengthened by highly temperature-resistant HfC carbides [23,24], the principle of reinforcement by script-like eutectic TaC carbides is still of interest, as rather recently demonstrated for some industrial applications (e.g.…”
Section: Introductionmentioning
confidence: 99%